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10853399 · CyC2018 · 4012e90b · 10853399
隐藏空白更改
内联并排

Showing with 3 addition and 1 deletion

notes/算法.md notes/算法.md +3 -1

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--- a/notes/算法.md
+++ b/notes/算法.md
@@ -301,10 +301,12 @@ public class Queue<Item> {
    }

    // 出队列
-    public Item dequeue(){
+    public Item dequeue() {
+        if (isEmpty()) return null;
        Node node = first;
        first = first.next;
        N--;
+        if (isEmpty()) last = null;
        return node.item;
    }
 }